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Jurnal Keteknikan Pertanian Tropis dan Biosistem
Published by Universitas Brawijaya
ISSN : -     EISSN : 2656243X     DOI : https://doi.org/10.21776/ub.jkptb
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Control & Systems Engineering Electrical & Electronics Engineering Energy Mechanical Engineering
Jurnal Keteknikan Pertanian Tropis dan Biosistem (JKPTB) (ISSN: 2656-243X) has published the state-of-art articles which focus on both fundamental studies and applied engineering including Power and Agricultural Machinery, Mechatronics and Agro-industrial Machinery, Food and Post-Harvest Technology and Soil and Water Engineering. By providing an update issue and current topic in agricultural technology field, JKPTB becomes the reference for many scientist and stakeholders who work on Agricultural Engineering
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 455 Documents
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Simulation of Robusta Coffee Fruit Detachment Dynamics as a Basic Concept for Designing a Selective Vibratory Mechanical Coffee Harvester Taufiq, Muhammad; Andriyani, Idah; Pambudi, Akbar Setyo; Yosika, Nur Ida Winni; Hita, Muhammad Arga; Arifin, Ahmad David Royyifi
Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 14 No. 2 (2026): August 2026
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

This study aims to formulate fruit detachment dynamics as the core concept for designing a selective vibratory mechanical harvester for robusta coffee. Plant-level average fruit removal force (FRF) and fruit mass data from five coffee plants were analysed for three maturity classes identified by color: red, orange, and green. An empirical FRF model was built using maturity code and fruit mass as predictors, after which a dynamic force model based on forced vibration, Fd = mA(2?f)², was used to simulate detachment behavior under different operating conditions. Model validation employed goodness-of-fit statistics and leave-one-out cross-validation, while selective harvesting performance was predicted through maturity-specific detachment probability curves. Mean FRF increased consistently with decreasing maturity, from 3.532 N in red fruits to 5.966 N in orange fruits and 8.034 N in green fruits, whereas fruit mass varied only slightly among stages. The empirical model showed high predictive accuracy (R² = 0.997; RMSE = 0.095 N), indicating that maturity status dominated the FRF response. Simulation results demonstrated that, at a vibration amplitude of 3 mm, equivalent threshold frequencies were approximately 99.9 Hz for red fruits, 129.9 Hz for orange fruits, and 151.3 Hz for green fruits. An optimum selective operating window of 3.60-5.91 N, equivalent to 101.0-129.4 Hz, was identified for maximizing ripe-fruit recovery while maintaining high harvest purity.
Sustainable Postharvest Preservation of Cherry Tomato Through Combined Ozone Pretreatment and Hypobaric Storage Maharani, Dewi Maya; Setiani, Putri; Paramartha, Kien Ratu; Hawa, La Choviya; Yulianingsih, Rini; Mastoto Ika, Nurbianto Puji; Saraswanto, Yossi Hendrawan
Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 14 No. 2 (2026): August 2026
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

Cherry tomato (Solanum lycopersicum L. var. cerasiforme) is a highly perishable horticultural commodity that requires proper postharvest handling to maintain quality and extend shelf life. This study evaluated the effects of ozone pretreatment (ozone gas and ozonated water) combined with hypobaric storage at pressures of 26, 64, and 101 kPa on the quality of cherry tomatoes during storage. Observed parameters included color change (?E), total soluble solids (TSS), moisture content, vitamin C and total fungal count. Color measurement was performed using a computer vision method based on the CIE L*, a*, b* color system, TSS was measured using a refractometer, moisture content using the oven method, and vitamin C using UV-Vis spectrophotometry. Two-way ANOVA showed that ozone pretreatment and hypobaric pressure had no significant effect on color change and moisture content (p>0.05). However, hypobaric pressure significantly affected TSS (p<0.05), with 26 kPa maintaining the highest TSS value (5.06 °Brix). Both ozone pretreatment and storage pressure had highly significant effects on vitamin C content (p<0.05). Ozone gas and ozonated water treatments retained higher vitamin C contents (43.99 and 42.13 mg/100 g, respectively) than the control (34.62 mg/100 g). Similarly, the highest vitamin C content was observed at 26 kPa (47.21 mg/100 g). Both treatment factors also significantly reduced fungal growth during storage (p<0.05). Tukey’s post hoc test showed that ozone gas pretreatment at 26 kPa resulted in the lowest total fungal colony count. The combination of ozone pretreatment and hypobaric storage 26 kPa has the potential to be an effective postharvest technology for maintaining nutritional quality and extending the shelf life of cherry tomatoes during storage.
Repurposing a Consumer Set-Top Box as a Low-Cost Edge Server for On-Device ODE-Based Growth Modeling of Hydroponic Fodder Handayani, Luluk; Nilogiri, Agung; Nurwahyudin, Rais
Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 14 No. 2 (2026): August 2026
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

Conventional hydroponic fodder production relies on manual, non-predictive monitoring, complicating feed planning. This study presents a low-cost edge-computing platform for hydroponic fodder built on a repurposed Linux set-top box (STB), integrated with an environment-driven growth model through a Hardware-in-the-Loop (HIL) scheme. The STB edge node hosts the MQTT broker, time-series database, and monitoring dashboard, while temperature and light are acquired in real time by SHT30 and BH1750 sensors via an ESP32. No physical load cell is used; biomass is therefore simulated by a logistic ordinary differential equation (ODE) with temperature-dependent rate r(T) and light-dependent carrying capacity K(L), driven by real environmental data recorded over a single 10-day cultivation cycle (20-29 June 2026, with interpolated gaps flagged). The model is calibrated to two empirical anchor points (1 kg at day 0, 13 kg reference at day 10); this agreement is reported as a calibration/consistency check rather than out-of-sample predictive validation. Sensitivity analysis shows the endpoint is dominated by carrying capacity (S = 0.96), and a fourth-order Runge-Kutta solver deviates only 0.007 kg from a reference integrator. Crucially, the complete model is executed on the STB itself using only the Python standard library: a full 10-day simulation completes in 46.6 ms (43.7 microseconds per RK4 step) within 15 MB of RAM at a stable 50 C, demonstrating that the edge node alone suffices without cloud computation.
The Effectiveness of Potassium Permanganate (KMnO4) As an Oxidizer in Bamboo Charcoal Briquette Production Putra, Alldy Nanda; Sabani, Rahmat; Kurniawan, Hary; Muttalib, Surya Abdul
Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 14 No. 2 (2026): August 2026
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

This research aims to increase the effectiveness of adding Potassium Permanganate (KMnO4) as an oxidizer in the process of making bamboo charcoal briquettes. The research methodology includes several stages, starting from preparing bamboo waste raw materials, the carbonization process to produce charcoal, to printing briquettes with varying concentrations of KMnO4 (0, 5, 7.5 and 10%). Tests carried out include analysis of heating value, combustion rate, density, air content, compressive strength, ignition duration and ash content to determine the physical and chemical characteristics of the briquettes. The results showed that the addition of KMnO4 had a significant effect on the parameters tested. A KMnO4 concentration of 10% speeds up the ignition time of briquettes significantly to 15 seconds, but results in a decrease in the highest heating value from 5382 cal/g (at 0%) to 5131 cal/g and an increase in the highest ash content to 16.7 g. Treatment with a concentration of 5% showed the most optimal compressive strength value. The use of KMnO4 is effective in accelerating initial ignition but can reduce several other essential qualities such as heating value and ash content. Determining the right concentration is crucial to producing briquettes with balanced performance.
Effects of Pretreatment and Freeze Drying on Physical and Functional Properties of Red Dragon Fruit (Hylocereus polyrhizus) Peel Flour Damayanti, Retno; Irfani, Ahmad Fahmi Nur; Sandra; Setiawan, Dwi; Ika, Nurbianto Puji Mahastoto; Saraswanto, Yossi Hendrawan
Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 14 No. 2 (2026): August 2026
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

Red dragon fruit (Hylocereus polyrhizus) peel was an underutilized agro-industrial byproduct with high potential as a functional food ingredient due to its pigments and bioactive compounds; however, processing challenges limited its application. This study analyzed the effects of blanching and slicing pretreatments on the physical and functional properties of red dragon fruit peel flour produced using freeze drying. The results showed that the moisture content ranged from 7–12%, meeting standard flour requirements, and was not significantly affected by the treatments, confirming the effectiveness of freeze drying in moisture removal. Yield was significantly influenced by the pretreatments, with the highest value obtained in the blanching–sliced treatment (1.66%) and the lowest in the non-blanching–non-sliced treatment (0.91%). Color characteristics were also significantly affected, where blanching decreased lightness (L*) but increased redness (a*). The highest a* value (32.04) was observed in the blanching–sliced treatment, indicating improved betalain pigment stability due to enzyme inactivation. In contrast, water holding capacity (1.25–3.13%), oil holding capacity (21.17–37.13%), and swelling power (0.92–0.98 g/g) did not differ significantly among treatments. These findings indicated that the combination of blanching and slicing was the most effective pretreatment for enhancing yield and maintaining color stability. The study demonstrated the potential of freeze-dried dragon fruit peel flour as a functional food ingredient and supported the valorization of agricultural waste into value-added products.

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